Information on which hairstyles best complement different face shapes can be found at the SheKnows and InStyle websites. The InStyle website provides examples using images of celebrities.
The SheKnows website has more thorough information, including a guide to determining face shape and sections describing the best hairstyles for each. It also provides information on which sunglasses and makeup styles suit each face shape.
Another good source of information about the best hair styles for different face shapes is TheHairstyler.. Similar to SheKnows, this website has a guide to determining face shape from a choice of seven, along with sections describing the most flattering hairstyles for each.